There is a prep school on Ross's campus for children of students and staff/faculty that a few of the significant others of students work at. I'm not sure what kind of qualifications are needed or if there are any openings. Otherwise there really aren't that many opportunities. Some people made jewelry, one girl's boyfriend makes pierogies every other week and sells them to students, some provide doggy daycare during the day, some offer fitness classes, etc. So basically you have to create your own work. They're pretty strict with work visas here and most jobs are given to locals if your significant other and a local were both to apply. But if your wife has a minor in education, it may be worth it to at least bring it up with admissions or whoever is in charge of hiring for the prep school (I'm really sorry, I don't know who it is).